基于 GIS的岩溶山地区耕地质量评价--以靖西县为例

摘要

岩溶山地区耕地质量评价是岩溶山地区耕地质量保护和管理的重要手段。以广西靖西县为研究区域，以农用地分等成果数据、第二次土地利用变更调查成果、实地调查数据和其他资料数据为数据主要来源，应用MapGIS软件叠加分析，获取综合反映耕地质量特征的评价指标属性数据，运用多因素综合评价模型，计算耕地质量得分并划分质量等级，进而分析耕地质量总体特征及空间地域分布特征。结果表明：靖西县耕地质量利用等别以中、高等地为主，占全县耕地面积的68.58%，水田质量整体上高于旱地，耕地质量空间分异特征呈现“西北部低，中、东部高”的特点，与当地实际情况符合，能够为国土资源管理提供科学依据。%Agricultural land quality assessment of karst mountain areas is an impor-tant means to protect and manage cultivated land quality of karst mountain areas. With Jingxi County as a case, the data resources included achievements of cultivat-ed land grade, achievements of second land investigation, investigation of local con-ditions and the other data resources. With the overlay tool of MapGIS, attribute data of evaluation index were obtained, which can reflect agricultural land's characteris-tics, and agricultural land quality scores were calculated and land quality was grad-ed using the model of comprehensive evaluation of multiple factors to make further analysis on characteristics and spatial distribution. The results showed that used agricultural land is dominated by middle and high-grade lands in Jingxi County mainly, representing 68.58% of Jingxi County’s agricultural lands. On the other hand, the quality of paddy land is general y higher than that of dry land, and quality of agricultural land showed higher in middle and eastern Jingxi, and lower in north-western region, which provides references for national land management.